Publications by authors named "J PLANE"
Mercury (Hg) is a global pollutant with substantial risks to human and ecosystem health. By upward transport in tropical regions, mercury enters into the stratosphere, but the contribution of the stratosphere to global mercury dispersion and deposition remains unknown. We find that between 5 and 50% (passing through the 400-kelvin isentropic surface and tropopause, respectively) of the mercury mass deposited on Earth's surface is chemically processed in the lower stratosphere.
View Article and Find Full Text PDFMetals from spacecraft reentry in stratospheric aerosol particles.
Proc Natl Acad Sci U S A
October 2023
Large increases in the number of low earth orbit satellites are projected in the coming decades [L. Schulz, K.-H.
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- Ocean-emitted short-lived halogens are common in the atmosphere, and their natural emissions have increased due to human activities since pre-industrial times, along with added human-made halocarbons.
- These halogens have a significant indirect cooling effect on Earth's radiative balance, calculated at about -0.13 watts per square meter, influenced primarily by their effects on ozone and moderated by methane and aerosols.
- This cooling effect has risen by 61% since 1750 and is expected to change by 18-31% by 2100, highlighting the need to include short-lived halogens in climate models for better predictions of the climate system.
The room-temperature rate constants and product branching fractions of CaO ( = 0-3) + O are measured using a selected ion flow tube apparatus. Ca + O produces CaO + O with = 9 ± 4 × 10 cm s, within uncertainty equal to the Langevin capture rate constant. This value is significantly larger than several literature values.
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